JPH08214395A - Repulsive magnetic circuit of speaker - Google Patents

Repulsive magnetic circuit of speaker

Info

Publication number
JPH08214395A
JPH08214395A JP3776795A JP3776795A JPH08214395A JP H08214395 A JPH08214395 A JP H08214395A JP 3776795 A JP3776795 A JP 3776795A JP 3776795 A JP3776795 A JP 3776795A JP H08214395 A JPH08214395 A JP H08214395A
Authority
JP
Japan
Prior art keywords
center plate
magnet
repulsive magnetic
magnetic circuit
magnets
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP3776795A
Other languages
Japanese (ja)
Other versions
JP3207697B2 (en
Inventor
Hiroyuki Kumakura
弘幸 熊倉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kenwood KK
Original Assignee
Kenwood KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kenwood KK filed Critical Kenwood KK
Priority to JP03776795A priority Critical patent/JP3207697B2/en
Publication of JPH08214395A publication Critical patent/JPH08214395A/en
Application granted granted Critical
Publication of JP3207697B2 publication Critical patent/JP3207697B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

PURPOSE: To provide the repulsive magnetic circuit of a speaker capable of increasing valid magnetic fluxes related to the driving energy of a voice coil without increasing the volume of a magnet. CONSTITUTION: The two magnets M1 and M2 are arranged holding a center plate P composed of a ferromagnetic body there between so as to let the same pole face each other, the voice coil is arranged at the outer periphery of the center plate P so as to be positioned within a repulsive magnetic field by both magnets M1 and M2 and a diaphragm is driven by the voice coil. Then, the magnets M1 and M2 are turned to a shape by which a surface 11 on the opposite side of the surface 12 to be in contact with the center plate P is not parallel to the contact surface 12 of the center plate P and the magnets.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、反発磁気回路型スピー
カにおける反発磁気回路に係り、特にそのマグネットと
センタープレートの形状及び寸法比を最適に設定した反
発磁気回路に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repulsive magnetic circuit in a repulsive magnetic circuit type speaker, and more particularly to a repulsive magnetic circuit in which the shape and size ratio of its magnet and center plate are optimally set.

【0002】[0002]

【従来の技術】従来より、磁性体からなるセンタープレ
ートを挾んで2個のマグネットを同極同士が対向するよ
うに配置し、両マグネットによる反発磁界内に位置する
ようにセンタープレートの外周にボイスコイルを配置し
て該ボイスコイルで振動板を駆動するように構成した反
発磁気回路型スピーカがあり、我々もこの形式のスピー
カを改善して先に種々提案した。
2. Description of the Related Art Conventionally, a center plate made of a magnetic material is sandwiched between two magnets so that the same poles face each other, and a voice is placed on the outer periphery of the center plate so as to be positioned within the repulsive magnetic field of both magnets. There is a repulsive magnetic circuit type speaker in which a coil is arranged and a diaphragm is driven by the voice coil. We have also improved this type of speaker and have made various proposals previously.

【0003】図5に示すものはその一例であり、強磁性
体からなるセンタープレートPを挾んで2個のマグネッ
トM1,M2を同極同士が対向するように配置し、両マ
グネットによる反発磁界内に位置するようにセンタープ
レートPの外周にボイスコイル1を配置して該ボイスコ
イル1で振動板2を駆動するように構成したものであ
る。図において、3はダンパー、4はホルダー、5はフ
レーム、6はコイルボビン、7はコイル部、8はダスト
キャップを示している。
One example is shown in FIG. 5, in which two magnets M1 and M2 are arranged with a center plate P made of a ferromagnetic material sandwiched therebetween so that the same poles face each other. The voice coil 1 is arranged on the outer circumference of the center plate P so as to be located at the position, and the diaphragm 2 is driven by the voice coil 1. In the figure, 3 is a damper, 4 is a holder, 5 is a frame, 6 is a coil bobbin, 7 is a coil portion, and 8 is a dust cap.

【0004】一般的に、従来の反発磁気回路は図3に示
すように構成され、マグネットM1,M2とセンタープ
レートPの寸法比は、センタープレートPの外周を10
0としたとき、マグネットM1,M2の外径は96、内
径は34、厚さは26、センタープレートPの内径は3
4、厚さが23である。従って、両マグネットM1,M
2は、センタープレートPと接触する面と反対側の面と
が平行になっている。
Generally, a conventional repulsive magnetic circuit is constructed as shown in FIG. 3, and the dimensional ratio of the magnets M1, M2 and the center plate P is 10 on the outer circumference of the center plate P.
When set to 0, the outer diameters of the magnets M1 and M2 are 96, the inner diameter is 34, the thickness is 26, and the inner diameter of the center plate P is 3
4, the thickness is 23. Therefore, both magnets M1, M
In No. 2, the surface in contact with the center plate P and the surface on the opposite side are parallel to each other.

【0005】[0005]

【発明が解決しようとする課題】従来のセンタープレー
トPの外周をφ35mm、ボイスコイルに係る有効磁束
領域をφ36mm、長さ8mmとし、32メガガウスエ
ルステッドのエネルギーをもつマグネットとセンタープ
レートにはS40C相当の磁気特性を有する強磁性材を
使用し、有効磁束領域で積分してエネルギー量を求める
と、約2400ガウスcmとなる。
The conventional center plate P has an outer circumference of φ35 mm, an effective magnetic flux area related to the voice coil of φ36 mm and a length of 8 mm. A magnet having an energy of 32 mega gauss Oersted and a center plate are equivalent to S40C. When a ferromagnetic material having the magnetic properties of 1 is used and the energy amount is calculated by integrating in the effective magnetic flux region, it is about 2400 gauss cm.

【0006】反発磁気回路をもつスピーカの能率は、こ
のエネルギー量が大きいほど高くなる。このエネルギー
量を大きくするには、マグネットの体積を増加させてマ
グネットのもつエネルギー量を増やせばよいこととなる
が、マグネットの体積を大きくする方法ではマグネット
の体積増加分だけコストが上昇し、磁気回路全体の質量
が増加してしまう。
The efficiency of a speaker having a repulsive magnetic circuit increases as the amount of energy increases. To increase this amount of energy, the volume of the magnet should be increased to increase the amount of energy that the magnet has, but the method of increasing the volume of the magnet increases the cost by the increase of the volume of the magnet, The mass of the whole circuit increases.

【0007】そこで、本発明の目的は、マグネットの体
積を増加させることなくボイスコイルの駆動エネルギー
に係る有効磁束をより多くすることができるスピーカの
反発磁気回路を提供することにある。
Therefore, an object of the present invention is to provide a repulsive magnetic circuit of a speaker which can increase the effective magnetic flux related to the driving energy of the voice coil without increasing the volume of the magnet.

【0008】[0008]

【課題を解決するための手段】本発明のスピーカの反発
磁気回路は、強磁性体からなるセンタープレートを挾ん
で2個のマグネットが同極同士対向するように配置さ
れ、両マグネットによる反発磁界内に位置するようにセ
ンタープレートの外周にボイスコイルを配置して該ボイ
スコイルで振動板を駆動するように構成した反発磁気回
路型スピーカにおいて、少なくとも一方のマグネット、
好ましくは両マグネットを、センタープレートと接触す
る面の反対側の面がセンタープレートとマグネットの接
触面に対して平行でない形状となるように構成したもの
であり、マグネットは外周側が低くなっている。
In the repulsive magnetic circuit of the speaker of the present invention, two magnets are arranged so as to face each other with the same pole sandwiching a center plate made of a ferromagnetic material. In the repulsive magnetic circuit type speaker, in which a voice coil is arranged on the outer periphery of the center plate so as to be located at, and the diaphragm is driven by the voice coil, at least one magnet,
Preferably, both magnets are configured such that the surface on the side opposite to the surface in contact with the center plate is not parallel to the contact surface between the center plate and the magnet, and the magnet has a lower outer peripheral side.

【0009】このとき、ボイスコイルのセット位置によ
り決定されるセンタープレートの外径寸法を100とす
ると、マグネットの外径を96〜100、内径を17〜
23、外周部分の厚さを14〜20、内周部分の厚さを
31〜37、センタープレートの内径を10〜17、厚
さを13〜19の寸法比に設定する。
At this time, when the outer diameter of the center plate determined by the set position of the voice coil is 100, the outer diameter of the magnet is 96 to 100 and the inner diameter is 17 to.
23, the thickness of the outer peripheral portion is set to 14 to 20, the thickness of the inner peripheral portion is set to 31 to 37, the inner diameter of the center plate is set to 10 to 17, and the thickness is set to 13 to 19.

【0010】[0010]

【作用】マグネットには残留磁束密度1.16T、比透
磁1.05の性能をもつNd・Fe・B異方性焼結マグ
ネットを、強磁性体のセンタープレートにはS40C相
当の磁気特性をもつ材料を用いて、最適化プログラムに
より変数コントロールした非線形磁場解折を行って計算
すると、ボイスコイルのセット位置により決定されるセ
ンタープレートの外径寸法を100とすると、マグネッ
トの外径を96〜100、内径を17〜23、外周部分
の厚さを14〜20、内周部分の厚さを31〜37、セ
ンタープレートの内径を10〜17、厚さを13〜19
の寸法比に設定することにより、マグネットの質量を増
加させないでエネルギー量が大きくなることが判明し
た。
[Function] The magnet is an Nd.Fe.B anisotropic sintered magnet having a residual magnetic flux density of 1.16T and a relative permeability of 1.05, and the ferromagnetic center plate has magnetic characteristics equivalent to S40C. When the non-linear magnetic field analysis in which the variables are controlled by the optimization program is performed using the material having the above, and the outer diameter of the center plate determined by the set position of the voice coil is 100, the outer diameter of the magnet is 96 to 100, inner diameter 17-23, outer peripheral thickness 14-20, inner peripheral thickness 31-37, center plate inner diameter 10-17, thickness 13-19
It has been found that the energy amount increases without increasing the mass of the magnet by setting the dimensional ratio of.

【0011】また、マグネットの外周側の高さが低くな
っていて、ダストキャップの形状に対応することとな
り、振動板に同じダストキャップを取り付けたとき、振
動板の振幅を大きく設定でき、従来よりも大入力仕様に
できる。しかも同じ曲率のダストキャップを使用した場
合、従来に比べてダストキャップの口径が小さくできる
ので、振動板の有効面積が大きくなり、能率が上がる。
Further, since the height of the outer circumference of the magnet is low, which corresponds to the shape of the dust cap, when the same dust cap is attached to the diaphragm, the amplitude of the diaphragm can be set to a large value, which is larger than the conventional one. Can be used for large input specifications. Moreover, when the dust cap having the same curvature is used, the diameter of the dust cap can be made smaller than that of the conventional one, so that the effective area of the diaphragm is increased and the efficiency is increased.

【0012】[0012]

【実施例】図1及び図2は本発明に係るスピーカの反発
磁気回路の実施例を示し、マグネットとセンタープレー
トを最も好ましい寸法に設定した状態の断面図である。
図において、Pは強磁性体からなるセンタープレート、
M1,M2はセンタープレートPを挾んで同極同士が対
向するように配置された2個のマグネットであり、従来
と同様に、両マグネットM1,M2による反発磁界内に
位置するようにセンタープレートPの外周にボイスコイ
ルを配置して該ボイスコイルで振動板を駆動するように
構成される。
1 and 2 are sectional views showing an embodiment of a repulsive magnetic circuit of a speaker according to the present invention, in which a magnet and a center plate are set to most preferable dimensions.
In the figure, P is a center plate made of a ferromagnetic material,
M1 and M2 are two magnets arranged so that the same poles face each other across the center plate P. As in the conventional case, the center plate P is positioned so as to be positioned within the repulsive magnetic field of both magnets M1 and M2. A voice coil is arranged on the outer periphery of the diaphragm and the diaphragm is driven by the voice coil.

【0013】本発明においては、マグネットM1,M2
は、センタープレートPと接触する面12の反対側の面
11がセンタープレートとマグネットの接触面12に対
して平行でない形状をなしている。従って、センタープ
レートPと接触する面12の反対側の面11は外周側が
低くなっている。
In the present invention, the magnets M1 and M2
Has a shape in which the surface 11 opposite to the surface 12 that contacts the center plate P is not parallel to the contact surface 12 of the center plate and the magnet. Therefore, the outer surface of the surface 11 opposite to the surface 12 that contacts the center plate P is low.

【0014】図1及び図2の実施例においては、マグネ
ットM1,M2には残留磁束密度1.16T、比透磁
1.05の性能をもつNd・Fe・B異方性焼結マグネ
ットを、強磁性体のセンタープレートにはS40C相当
の磁気特性をもつ材料が用いられ、センタープレートの
外周をφ35mm、有効磁束領域MEを8mmとしたと
き、マグネットの外径をφ34.9、内径をφ7.0、
外周の厚さを5.9mm、内周の厚さを11.9mm、
センタープレートの内径をφ4.9mm、厚さを5.6
mmとした。
In the embodiment of FIGS. 1 and 2, the magnets M1 and M2 are Nd.Fe.B anisotropic sintered magnets having residual magnetic flux density of 1.16T and relative permeability of 1.05. A material having magnetic characteristics equivalent to S40C is used for the ferromagnetic center plate, and when the outer circumference of the center plate is φ35 mm and the effective magnetic flux area ME is 8 mm, the outer diameter of the magnet is φ34.9 and the inner diameter is φ7. 0,
The outer peripheral thickness is 5.9 mm, the inner peripheral thickness is 11.9 mm,
The center plate has an inner diameter of φ4.9 mm and a thickness of 5.6.
mm.

【0015】図1及び図2の実施例の値は、最適化プロ
グラムにより変数コントロールした非線形磁場解折を行
って計算して得たものである。その結果、図1及び図2
で示したようなマグネット形状としたとき、最もエネル
ギー量が大きくなることが判明した。このときのエネル
ギー量は、2570ガウスcmとなり、同じ体積のマグ
ネットをもつ従来のものに比べ、エネルギー効率が約7
%アップした。
The values of the embodiments shown in FIGS. 1 and 2 are obtained by calculation by performing nonlinear magnetic field analysis with variable control by an optimization program. As a result, FIG. 1 and FIG.
It was found that the amount of energy becomes the largest when the magnet shape as shown in is used. The amount of energy at this time is 2570 gauss cm, and the energy efficiency is about 7 compared with the conventional one having the magnet of the same volume.
% Up.

【0016】なお、エネルギー効率のアップ率が多少低
下するが、上記実施例の値の範囲内に限らず、ボイスコ
イルのセット位置により決定されるセンタープレートの
外径寸法を100とすると、マグネットの外径が96〜
100、内径が17〜23、外周部分の厚さが14〜2
0、内周部分の厚さが31〜37、センタープレートの
内径が10〜17、厚さが13〜19の寸法比の範囲内
であってもエネルギー効率のアップを望むことができ、
上記の範囲外であると効果が低下することが判明した。
Although the rate of increase in energy efficiency is somewhat lowered, the outer diameter of the center plate determined by the set position of the voice coil is 100, which is not limited to the range of the values in the above embodiment, and the magnet's Outer diameter is 96 ~
100, inner diameter 17-23, outer peripheral thickness 14-2
0, the inner peripheral part has a thickness of 31 to 37, the center plate has an inner diameter of 10 to 17, and the thickness is within the range of 13 to 19, the energy efficiency can be improved.
It has been found that the effect is reduced when it is out of the above range.

【0017】また、図2に示すように、マグネットM1
の外周側の高さが低くなっていて、ダストキャップ8の
形状に対応しているから、振動板に同じダストキャップ
8を取り付けたとき、仮想線8aで示す位置まで振幅で
きる。従って振動板の振幅を大きく設定でき、図4に示
す従来のものよりも大入力仕様にできる。しかも同じ曲
率のダストキャップ8を使用した場合、図4の従来のも
のに比べてダストキャップ8の口径を小さくできるの
で、振動板の有効面積が大きくなり、能率を上げること
ができる。
Further, as shown in FIG. 2, the magnet M1
Since the height on the outer peripheral side is low and corresponds to the shape of the dust cap 8, when the same dust cap 8 is attached to the diaphragm, the amplitude can be increased to the position indicated by the virtual line 8a. Therefore, the amplitude of the diaphragm can be set large, and the input specifications can be made larger than those of the conventional one shown in FIG. Moreover, when the dust cap 8 having the same curvature is used, the diameter of the dust cap 8 can be made smaller than that of the conventional one shown in FIG. 4, so that the effective area of the diaphragm is increased and the efficiency can be improved.

【0018】[0018]

【発明の効果】本発明のスピーカの反発磁気回路によれ
ば、次のような効果がある。 (1) マグネットの質量を増加させないで、ボイスコ
イルにかかるエネルギー量を増やすことができ、スピー
カの能率を上昇させることができる。 (2) マグネットの質量が変わらないから、スピーカ
の原材料費のコストを増加させることなく、能率という
性能を向上させることができる。 (3) 従来のものと同じ能率を確保するなら、マグネ
ット量が少なくてすむので、軽量化することができ、し
かもコストダウンを実現できる。 (4) マグネットの外周側の高さが低くなっていて、
ダストキャップの形状に対応するようになっているか
ら、振動板に同じダストキャップを取り付けたとき、振
動板の振幅を大きく設定でき、従来よりも大入力仕様に
できる。しかも同じ曲率のダストキャップを使用した場
合、従来に比べてダストキャップの口径が小さくできる
ので、振動板の有効面積が大きくなり、能率を上げるこ
とができる。
The speaker repulsion magnetic circuit of the present invention has the following effects. (1) The amount of energy applied to the voice coil can be increased without increasing the mass of the magnet, and the efficiency of the speaker can be increased. (2) Since the mass of the magnet does not change, the performance called efficiency can be improved without increasing the cost of the raw material cost of the speaker. (3) If the same efficiency as that of the conventional one is secured, the amount of magnets can be small, so that the weight can be reduced and the cost can be reduced. (4) The height of the outer circumference of the magnet is low,
Since it corresponds to the shape of the dust cap, when the same dust cap is attached to the diaphragm, the amplitude of the diaphragm can be set to a large value, and the input specifications can be made larger than before. Moreover, when the dust cap having the same curvature is used, the diameter of the dust cap can be made smaller than that of the conventional one, so that the effective area of the diaphragm is increased and the efficiency can be improved.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明に係るスピーカの反発磁気回路の実施例
を示す断面図。
FIG. 1 is a sectional view showing an embodiment of a repulsive magnetic circuit of a speaker according to the present invention.

【図2】振動板に取り付けられるダストキャップとの関
係を示す要部の断面図。
FIG. 2 is a cross-sectional view of a main part showing a relationship with a dust cap attached to the diaphragm.

【図3】従来の反発磁気回路の断面図。FIG. 3 is a cross-sectional view of a conventional repulsive magnetic circuit.

【図4】従来の反発磁気回路におけるダストキャップと
の関係を示す要部の断面図。
FIG. 4 is a sectional view of a main part showing a relationship with a dust cap in a conventional repulsive magnetic circuit.

【図5】我々が先に提案した反発磁気回路型スピーカの
断面図。
FIG. 5 is a cross-sectional view of the repulsive magnetic circuit type speaker that we previously proposed.

【符号の説明】[Explanation of symbols]

P センタープレート M1,M2 マグネット 11 マグネットのセンタープレートと接触する
面の反対側の面。 12 マグネットのセンタープレートとの接触
面。
P Center plate M1, M2 Magnet 11 Surface opposite to the surface of the magnet that contacts the center plate. 12 Contact surface with the center plate of the magnet.

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 強磁性体からなるセンタープレートを挾
んで2個のマグネットが同極同士対向するように配置さ
れ、両マグネットによる反発磁界内に位置するようにセ
ンタープレートの外周にボイスコイルを配置して該ボイ
スコイルで振動板を駆動するように構成した反発磁気回
路型スピーカにおいて、少なくとも一方のマグネット
は、センタープレートと接触する面の反対側の面がセン
タープレートとマグネットの接触面に対して平行でない
形状をなしていることを特徴とするスピーカの反発磁気
回路。
1. A voice coil is arranged on the outer circumference of a center plate so that two magnets are arranged so as to face each other across a center plate made of a ferromagnetic material and the magnets are located in a repulsive magnetic field. In the repulsive magnetic circuit type speaker configured to drive the diaphragm with the voice coil, at least one of the magnets has a surface opposite to the surface contacting the center plate with respect to the contact surface between the center plate and the magnet. A repulsive magnetic circuit for a speaker, which has a non-parallel shape.
【請求項2】 上部マグネットの上面及び下部マグネッ
トの下面が共にセンタープレートとの接触面に対して平
行でない形状をなしていることを特徴とする請求項1記
載のスピーカの反発磁気回路。
2. The repulsive magnetic circuit for a speaker according to claim 1, wherein both the upper surface of the upper magnet and the lower surface of the lower magnet are not parallel to the contact surface with the center plate.
【請求項3】 請求項1及び請求項2記載のスピーカの
反発磁気回路において、センタープレートと接触する面
の反対側の面は外周側が低くなっていることを特徴とす
るスピーカの反発磁気回路。
3. The repulsive magnetic circuit for a speaker according to claim 1 or 2, wherein a surface opposite to a surface contacting the center plate has a lower outer peripheral side.
【請求項4】 請求項1及び請求項2記載のスピーカの
反発磁気回路において、ボイスコイルのセット位置によ
り決定されるセンタープレートの外径寸法を100とす
ると、マグネットの外径が96〜100、内径が17〜
23、外周部分の厚さが14〜20、内周部分の厚さが
31〜37、センタープレートの内径が10〜17、厚
さが13〜19の寸法比に設定されていることを特徴と
するスピーカの反発磁気回路。
4. The repulsive magnetic circuit for a speaker according to claim 1, wherein the outer diameter of the magnet is 96 to 100, when the outer diameter of the center plate determined by the set position of the voice coil is 100. Inner diameter is 17 ~
23, the thickness of the outer peripheral portion is 14 to 20, the thickness of the inner peripheral portion is 31 to 37, the inner diameter of the center plate is 10 to 17, and the thickness is 13 to 19. Repulsive magnetic circuit of the speaker.
JP03776795A 1995-02-03 1995-02-03 Repulsion magnetic circuit of speaker Expired - Lifetime JP3207697B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP03776795A JP3207697B2 (en) 1995-02-03 1995-02-03 Repulsion magnetic circuit of speaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP03776795A JP3207697B2 (en) 1995-02-03 1995-02-03 Repulsion magnetic circuit of speaker

Publications (2)

Publication Number Publication Date
JPH08214395A true JPH08214395A (en) 1996-08-20
JP3207697B2 JP3207697B2 (en) 2001-09-10

Family

ID=12506627

Family Applications (1)

Application Number Title Priority Date Filing Date
JP03776795A Expired - Lifetime JP3207697B2 (en) 1995-02-03 1995-02-03 Repulsion magnetic circuit of speaker

Country Status (1)

Country Link
JP (1) JP3207697B2 (en)

Also Published As

Publication number Publication date
JP3207697B2 (en) 2001-09-10

Similar Documents

Publication Publication Date Title
EP1545151A2 (en) Speaker device with improved magnetic ciruit
JPH08214395A (en) Repulsive magnetic circuit of speaker
CN207692048U (en) A kind of bone-conduction speaker
US3971054A (en) Method and apparatus for magnetizing permanent magnet in magnetic structure
JPS56149900A (en) Dynamic speaker
CN206506703U (en) A kind of electroacoustic structure of magnetic altogether
JPH099392A (en) Speaker
CA1140666A (en) Electroacoustic device
JPS579197A (en) Speaker
JPS56114499A (en) Speaker
JPS6028400A (en) Dynamic speaker
JP2000358296A (en) Speaker and speaker device
JP3002687U (en) Speaker
JPS5839444Y2 (en) removable glasses
JP2603920Y2 (en) Speaker
JP3966129B2 (en) Speaker
JPS5518156A (en) Speaker
KR100531730B1 (en) Speaker
JPS6311822Y2 (en)
JPS5492316A (en) Electromagnetic type electro-acoustic transducer
JPS5863298A (en) Speaker
JPS5838713Y2 (en) Magnetic circuit structure of permanent magnet for speaker
JPH0413909Y2 (en)
JPH06261393A (en) Speaker
JPS5825440Y2 (en) Buzzer

Legal Events

Date Code Title Description
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20010529

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20070706

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080706

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080706

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090706

Year of fee payment: 8

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090706

Year of fee payment: 8

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100706

Year of fee payment: 9

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110706

Year of fee payment: 10

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110706

Year of fee payment: 10

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120706

Year of fee payment: 11

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120706

Year of fee payment: 11

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313111

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120706

Year of fee payment: 11

R360 Written notification for declining of transfer of rights

Free format text: JAPANESE INTERMEDIATE CODE: R360

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120706

Year of fee payment: 11

R360 Written notification for declining of transfer of rights

Free format text: JAPANESE INTERMEDIATE CODE: R360

R371 Transfer withdrawn

Free format text: JAPANESE INTERMEDIATE CODE: R371

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313111

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120706

Year of fee payment: 11

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120706

Year of fee payment: 11

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130706

Year of fee payment: 12

EXPY Cancellation because of completion of term